Physical private mobile telecommunications network

ABSTRACT

A supranational and inter-PLMN physical private mobile telecommunications network includes at least one first ( 1 ) and one second ( 2 ) physical node that can cooperate with the respective different public mobile networks (PLMN1, PLMN2), preferably located in different countries. These physical nodes have respective functionailties selected from the group consisting of:  
     masking functionality (M 1 , M 2 ) to handle the interworking with the respective public mobile network (PLMN 1 , PLMN 2 ),  
     filtering functionality (F 1 , F 2 ) to analyse the numbering of the internal called/calling customer in relation to the identity of the calling/called party,  
     a functionality managing the coordination and intelligent services (INC 1 , INC 2 ), which can control the call between the physical node of origin and the physical node visited, and thus permits the management of the virtual user mobility between the physical nodes as they are involved as well as the invocation of the intelligent services provided inside the different physical nodes, and  
     an interworking functionality (ITW 1 , ITW 2 ) configured so as to permit the interworking between signalling on Internet Protocol network (IP) and a circuit-switching signalling.

[0001] This invention relates to the production of telecommunicationsnetworks of the type currently referred to as physical private mobilenetwork, or in more commercial terms, “wireless office”, “wirelessenterprise” or “wireless PBX solution”.

[0002] For networks of this type it Is important to be able to integratethem with systems that have already been installed, such as a LAN (LocalArea Network) based on IP (Internet Protocol) technology and that arelocated in a corporate reality, with the possible presence of aPABX-type corporate switchboard (Private Automatic Branch exchange).

[0003] All this bearing in mind the fact that networks of this type aretypically destined to be employed in a supranational context, given thatthey are aimed at enterprises that have offices and branches indifferent countries. At least two private radiomobile systems have beenproposed, that aim to satisfy, at least partially, the afore-mentionedrequirements.

[0004] One system, produced by the American company Interwave, is calledGSM in A Box or Network in A Box. This system is commercialized inEurope by Nortel Cellular under the trade name Piconode.

[0005] Another system is that proposed by the Swedish company Ericssonunder the trade name of Ericsson GSM On A Net (EGON).

[0006] The first system mentioned above (henceforth referred to asPiconode for the sake of brevity) is interconnected via GSM (GlobalSystem for Mobile communication) standard A interface to a correspondingPLMN network (acronym for Public Land Mobile Network) and via PRIinterface to a corresponding PSTN network (Public Switched TelephoneNetwork). In a more recent variation, the interface to the PLMN is madewith IP transport (Internet Protocol).

[0007] In more recent variations, the manufacturer has positioned theBTS's (Base Transceiver Station) on the IP network and subsequently theA interface also.

[0008] The Piconode solution can produce multi-site, multi-nodenetworks, but not “supranational” networks, i.e. PLMN and/or PSTNnetworks handled in different ways (usually by different operators) indifferent countries.

[0009] The term “supranational” clearly refers to the context that iscurrently prevalent in the telecommunications sector, at least atEuropean level. It should, however, also be understood to refer to thepossibility of interfacing with different PLMN and/or PSTN networksconnected to different operators within the same country.

[0010] To return to the description of the Piconode system, however, oneof the main innovations is that a user profile has been introduced todistinguish between public user, hybrid user and private user.

[0011] The public user is only recognised by the public network HomeLocation Register or HLR, the private user only by the Piconode networkHLR, while the hybrid user is recognised by both HLR's. Mobility ishandled by circuit signalling as per the GSM standard.

[0012] The Piconode system does not offer new services that differ fromthe normal PLMN network, but exploits some of its specialcharacteristics. In particular, it does not have the capability tointerwork with other corporate databases that contain sensitive data.

[0013] One interesting aspect of the Piconode system is that it routescalls that originate at its input. This routing is carried out on thebasis of information resident in tables that can only be changed by thenetwork administrator. The system therefore permits call routing, butnot by the user, which means a service called “Incoming Call Screening”(or ICS) cannot be configured. Full flexibility is therefore notpossible, which is an important factor in the ICS service in a“corporate” environment.

[0014] The Ericsson system called EGON is based on the ITU-TRecommendation H.323, which describes the terminals, the equipment andservices for multimedia communication over a packet-based network.

[0015] The basic concept of H.323 is that of keeping call control andconnection control separate once established.

[0016] The EGON solution gives all business users of the corporateIntranet network the opportunity to use the user terminal mobilitywithin the IP network.

[0017] One of the main EGON system characteristics is the fact that thecorporate Intranet network can be accessed by GSM mobile terminals, IPfixed telephones and personal computers in order to give the corporateusers total mobility. Roaming is possible on the GSM public network.

[0018] System architecture is based essentially on the presence of threedifferent nodes called Service Node, Access Node and Application Nodeplus two gateway functionalities, Signalling Gateway and Voice Gateway.

[0019] The service node is the core of the service and as such isresponsible for the following functions:

[0020] call setup and routing,

[0021] user administration, and

[0022] handling of security and services offered.

[0023] As regards call setup and routing, the service node controls allthe calls made between different types of terminals and translates theaddresses between different types of access, for example between PSTNtelephone numbers and addresses in the system.

[0024] User administration has the task of handling all users withregistered system identity and service profile. The profile lists allthe services to which the user has access.

[0025] Management of security and the services offered includesfunctions of authentication, resource management and least-cost routing.This function includes an API (Application Program Interface) forhigh-level access and applications (voice mail and fax, e-mail,web-initiated dialling and other vertical applications).

[0026] The access node enables GSM mobile terminals to access the systemby handling system radio resources and the mobility of the users in thenetwork.

[0027] The access node is involved whenever a call is set up to or froma GSM mobile terminal. The node does not carry any traffic information,but controls communication between the GSM mobile terminals involved. Itcan interrogate the Home Location Register (HLR), manage the roamingnumbers and run/control the paging and handover processes.

[0028] In terms of the public GSM network, the access node and itsunderlying structure are perceived as a Location Area within thecorporate network. The application node enables high-level applicationsto interact with the system through an API. Available applications are:

[0029] Web-initiated Dialling,

[0030] Directory-assisted Dialling

[0031] unified messaging service, and

[0032] simplified integration with LAN-based business support systems.

[0033] The signalling gateway respectively translates between thetypical protocol architecture levels on a common channel incircuit-switching mode in the TCP/IP protocol (Transmission ControlProtocol/Internet Protocol) for signalling information transport, and inpacket-switching mode within the EGON system IP network.

[0034] The voice gateway translates the voice communications between thecircuit-switching public networks and the packet-switching private IPtype EGON network. The voice gateway is capable of examining fax andvoice type calls from the circuit-switching public networks and transferthem in an appropriate format to the packet-switching EGON system IPnetwork. At the same time it is capable of examining voice and fax callsforwarded from terminals inside the EGON system IP network andreconstruct the data flow before transmitting it on thecircuit-switching public networks.

[0035] One of the critical aspects of the EGON system is the complexityof the IP protocol required to ensure, on the one hand, the physicalpossibility of performing the multimedia services inside the system, andon the other hand, the presence and co-existence of the fixed and mobileterminals and the network equipment described in ITU-T recommendationH.323.

[0036] Another critical aspect is the need to provide a gateway for thetranslations involving the protocols referred to previously, signallinginformation and voice and data services that transit betweencircuit-switching public networks PSTN and PLMN and the packet-switchingIP EGON network. This system, in addition, is currently not capable ofmasking the management of employee mobility between the physicalnational corporate nodes as they are involved, for the external publicnetworks.

[0037] Neither is the system currently able to ensure one of therequirements considered important by the corporate customer, i.e. totalreachability of an employee, be he/she under public or private domesticcoverage or under public or private visited coverage as a roamer user.

[0038] Other critical aspects of the system are related to theportability of the intelligent network services based on mechanisms andprotocols of the proprietary type between two physical nodes in aphysical private supranational network. This applies, for example, forthe possible activation of the intelligent services resident on aphysical, domestic node from a visited physical node. In other words,the user that is roaming on a physical visited node cannot, from remote,use a set of services based on an intelligent network and located on thedomestic node of the corporate network.

[0039] The aim of this invention is to create a physical private mobilenetwork capable of overcoming the problems described above withreference to some already well-known systems.

[0040] In this invention, this aim is reached by means of a network withthe features referred to specifically in the following claims.

[0041] In short, the application range for the solution expounded inthis invention is the transport of voice, data and signalling. Thesolution given in this invention uses the transport on IP networks wherethese are present, even though this is not an essential pre-requisite.The solution, in fact, adapts itself to other means of transport thatare less innovative than the packet-switching networks.

[0042] The solution adapts itself in a particularly advantageous way toa context of physical private supranational networks that use thecorporate IP intranet network. In more general terms, it adapts toconnection with PLMN and/or PSTN networks that are different from oneanother. As such, the solution according to the invention can be used toadvantage by all the companies with offices and branches in differentcountries.

[0043] The preferential application scope of the solution according tothe invention is therefore the world of large and medium-sizedbusinesses. The same solution, however, can also be applied in the caseof small businesses or professional studios.

[0044] The solution offered by the invention is able to provide thefollowing services:

[0045] management of a virtual user mobility, depending on the private

[0046] radiomobile network;

[0047] total user reachability;

[0048] portability of the intelligent network services; and

[0049] possible choice of the ways of routing the outgoing calls fromthe private radiomobile network made directly by the corporate customer.

[0050] The management of a virtual user mobility is considered extremelyimportant by the corporate client, especially by large and medium-sizedbusinesses, in that it allows the company to mask the mobility of anemployee to all the different PLMN's (usually located in differentcountries) where there is one or more nodes for the company's physicalprivate mobile network. In this way, whenever an employee moves awayfrom a physical corporate node in a given network, e.g. national, andmoves to another physical node in the corporate network, which may be inanother country, the corresponding PLMN networks involved have no way ofrealising that any move has been made.

[0051] The management of virtual user mobility is enabled by a maskingfunctionality that allows the corporate employees to make voice and datacalls involving, for example, two different company offices withoutusing the international public interconnection sections.

[0052] Total user reachability is considered essential by the corporatecustomer since it means that It is possible to have constant informationof an employee's physical whereabouts in an international context.

[0053] The portability of the intelligent network services can be basedon standard solutions or solutions in the process of being standardisedsuch as CAMEL PHASE 1, PHASE 2, PHASE 3, PHASE 4 and more generically,on proprietary solutions.

[0054] The portability of the intelligent network services betweenseveral offices of the private radiomobile supranational corporatenetwork is a requisite deemed strategic by many corporate customers, inthat it allows a company employee roaming on the corporate visitedphysical node to use, from remote, all the services on the corporateresident physical node by activating the service logic to which they areassociated.

[0055] Finally, the possibility of choosing the ways of routing theoutgoing calls is an important requisite in that it allows the corporatecustomer to directly manage the costs associated to all the callsoutgoing from the physical “national” node destined to another physicalnode of the corporate network, which may be in another country.

[0056] The installation and the operation of the solution according tothe invention can be easily integrated and are advisable if there is aprivate telecommunications network such as a LAN based on InternetProtocol technology (LAN IP) and located in the corporate environmentwith possibly a PABX company switchboard. The solution has beendeveloped paying particular attention to the possible application tosecond-generation technologies such as GSM and GPRS (General PacketRadio Services), and to the third-generation mobile technologies such asUMTS (Universal Mobile Telecommunication System) and IMT2000.

[0057] The invention basically configures the network as a supranationalnetwork in that, on the one hand it permits interconnection withdifferent PLMN networks (usually in different countries), and on theother hand, it recognises and distinguishes the different nationalitiesof the users subscribed to the different nodes on the same physicalprivate mobile network that is physically located in differentcountries. This results in considerable savings in the generalmanagement of corporate telecommunications traffic as it combines thereachability function with the functions of mobility, routing andsignalling management.

[0058] The users in individual countries are customers of the publicmobile network operator in that country. Each branch user, therefore,has a SIM (Subscriber Identity Module) that belongs to the public mobilenetwork operator of the country in which it operates.

[0059] The invention will now be described with a purely non-limitingexample and the annexed drawings in which:

[0060]FIG. 1 is a schematic drawing of the overall architecture of anetwork according to the invention, and

[0061]FIG. 2 is a functional block diagram that illustrates thearchitecture of two physical nodes in a network according to theinvention.

[0062]FIG. 1 basically illustrates the possible co-existence and themethods of network interconnection with mobile networks PLMN1 and PLMN2that are different from each other.

[0063] The following description supposes that, as occurs in themajority of cases at least at the present moment, the two physical nodesof the network in question are located in two different countries thatare divided by a frontier represented by dashed line B.

[0064] The same considerations apply for the corresponding fixednetworks PSTN1 and PSTN2.

[0065] Generally speaking, it is supposed that the PLMN1, PLMN2, PSTN1and PSTN2 networks can communicate with each other using well-knownmethods, via an international transit network, called RTI.

[0066] It should be remembered that the solution as described in theinvention can be applied to contexts where there are different PLMN1 andPLMN2 mobile networks and/or different PSTN1, PSTN2 fixed networks,which can interact with each other through an RTI transit networkregardless of their location in different countries. As alreadymentioned, the reference to different countries is dictated by the factthat the current prevalent situation envisages that the networksillustrated in FIG. 1 and distinguished with the numbers 1 and 2 arephysically located in different countries.

[0067] Specifically, the diagram in FIG. 1 is intended to illustrate thepossibility of co-existence and the methods of interconnection betweenthe physical private mobile network, invention, and the mobile networksPLMN1 and PLMN2 that serve two international offices of the samebusiness.

[0068] Reference to the IP signalling indicates the main networkprotocol adopted for the exchange of signalling information within thenetwork, while the reference VoIP relates to the method of transmissionof the voice between two physical nodes, identified with 1 and 2respectively, located in the physical private mobile network. Twocorresponding switchboards, PBX1 and PBX2, are also illustrated.

[0069] It should be noted that, even if for simplicity's sake thedescription refers to only two physical nodes, identified with 1 and 2,the solution given in the invention generally envisages the presence ofn number of physical nodes.

[0070] Both physical nodes 1 and 2, the structure of which isillustrated in greater detail in FIG. 2, include the functionalities ofradio resources, switching, control and database containing userprofiles and service logics of all the company employees that use thesystem as per the invention.

[0071]FIG. 2 illustrates the detailed architecture of the methods ofinteraction between the two nodes 1 and 2, and the interaction with thepublic networks PLMN1, PLMN2, PSTN1 and PSTN2.

[0072] In particular, physical node 1, assumed to be located in onecountry, is connected directly via interface A to an MSC (MobileSwitching Center)/VLR (Visitors Location Register) module of the PLMN1network, whose respective Home Location Register is referred to as HLR1.

[0073] In exactly the same way, physical node 2, assumed to be locatedin another country, is connected directly via interface A to the MSC/VLRof the PLMN2 network.

[0074] Given the aforesaid basic symmetry, the following descriptionrefers explicitly to the features of one of the nodes 1, 2, and itshould be understood that what is specified for one of the nodes shouldbe taken to apply to the other node also, the respective parts beingidentified with the numbers 1 and 2.

[0075] Each physical node, 1, 2 of the physical, private mobile networkas referred to in the invention, allows an PC functionality able toperform switching activities. This function is connected to the localPABX (PBX1, PBX2), which can exchange signalling information with thefixed public network. An interworking (ITW) functionality is thereforeassociated with the PABX, which means that the circuit-switchedsignalling can be translated into VoIP signalling and vice versa.

[0076] All the signalling information, the voice services and the dataservices are transported on the IP network inside the network as per theinvention. Generally, the physical nodes 1 and 2, each connected viainterface A to the respective public radiomobile network are connectedto each other via a specific proprietary protocol or via knownstandardised protocols for the mobility management of each user betweenthe physical nodes, the management of the user profiles and the servicelogics between the physical node of origin and the visited physicalnode, the setup of the voice call between the physical nodes, thecoordination of actions co-related between the physical node of originand the visited physical node. The first hypothesis of connectionbetween the nodes makes the invention particularly efficient.

[0077] Signalling information is exchanged between the two physicalnodes 1 and 2 via the afore-mentioned proprietary or standardisedprotocols, which refer to the IP transmission standards.

[0078] Each physical node envisages the following functionalities:

[0079] M1, M2 masking: dedicated to the management of the interworkingwith the PLMN1 and PLMN2 networks via interface A, and to the managementof a virtual user mobility between the physical nodes as they areinvolved;

[0080] F1, F2 filtering: supervises the analysis of the identificationnumber of the internal customer called/calling in relation to thecaller/called identification in order to ensure that the call treatmentmethods, given in the corresponding profiles and actuated by the maskingfunctions M1, M2, and the Incoming Call Screening functions are allcarried out;

[0081] intelligent services logics plus coordination INC1, INC2:supervises the coordination functions connected to the setup of the callbetween the physical node of origin and the visited physical node andpermits, for example, the invocation of the intelligent network servicelogics that already exist and are resident Inside physical nodes thatare geographically distant from each other. It also supervises theinvocation of the intelligent network service logics that are madeavailable by the PLMN1 and the PLMN2;

[0082] ITW1, ITW2 interworking: executes the interworking betweencircuit-switched signalling on interface A and the signalling on IPnetwork.

[0083] The PABX interfaces with the PSTN fixed public network.Consequently there is an element that acts as gateway between the PABXand the switchboard of the PSTN public fixed network.

[0084] The voice calls are executed in VoIP mode.

[0085] The database functionalities can be sub-divided further into aresidents database Home1, Home2 and a vistors database Visit1 andVisit2.

[0086] The residents database Home1, Home2 contains user profilesdefined on a specific physical node. The user profile contains thevarious access rights to the telecommunications services, both asregards call generation and reception, as well as supplementaryservices. The profile also contains the instructions required to managethe services normally provided by the intelligent network. The residentdatabase is connected to corporate database BDS1, BDS2 on the corporateLAN IP, which contains the information that permits total userreachability.

[0087] The visitors database Visit1, Visit2, on the other hand, containsthe data of the users visiting the visited physical node office. Thedata contained permit the use of the telecommunications services(including all the intelligent network services) as if the user were atthe physical node of origin.

[0088] The invention permits each calling user, connected to thephysical node of a system country or connected to the public mobilenetwork of a country, to be connected, directly and via an IP connectionbetween the two physical nodes, to the user called that is connected tothe visited physical node or on the public mobile network of anothercountry. Once the appropriate checks to confirm the physical whereaboutsof the employee have been carried out, the call is set up by making aconnection on the IP network between the two physical nodes.

[0089] The M1, M2 masking functionality makes simulation of the GSMstandard protocol interface A possible on the MSC/VLR node of the publicnetwork (PLMN1 or PLMN2) to which the physical node is connected. Themasking functionality also permits the generation of messages needed tohandle user mobility, the calls and the radio resources. This happensboth when it is activated directly from the mobile terminal, and when itis commanded by the filtering functionality.

[0090] The M1, M2 masking functionality examines the incoming/outgoingcalls, consults the call treatment profiles and the user reachabilityinformation in the F1, F2 filtering functionality and in the BDS1, BDS2sensitive database respectively, then forwards this information to thecoordination functionality responsible for setting up the physicalconnections for call activation.

[0091] As shown in FIG. 2, communication between the variousfunctionalities is ensured via connection, for example, on the corporateLAN. The same FIG. 2 also shows there is a sensitive database, BDS1,BDS2 on each physical node.

[0092] The solution given in the invention therefore offers realmobility between cells of different physical nodes of the same network,and a virtual mobility as regards the public radiomobile networks PLMN1,PLMN2 via the M1, M2 masking functionality and the F1, F2 filteringfunctionality.

[0093] Another advantage is to be found in the possibility of generatingsignalling messages suitable for masking the user mobility, otherwiseperceived as real by the PLMN network, via the A interface of the GSMsystem.

[0094] This possibility can be carried out in all cases in which themobility encloses itself between physical nodes of the physical privatemobile network and assumes a purely virtual nature. In this way it ispossible to save on international traffic distributed via the potentialoffered by IP network transmission.

[0095] The solution, as per the invention, also offers total userreachability on the physical private mobile network. This relates to theintegrated management mode of the users connected to different systemphysical nodes, which are connected to PLMN networks that belong tooperators located in different countries. In this way, the users can beconsidered as belonging to a single mobile supranational PABX. Insidethe network referred to in the invention, in fact, the search for thereal position of the user is carried out by means of signalling, andmore important, without necessarily having to set up calls in circuit orpacket mode. Anyone, therefore, who has access to the LAN IP associatedto the network, referred to in the invention, can, if authorised,retrieve information on the real position of another system usertogether with all the attributes associated with that user registeredinside the system.

[0096] There is also the possibility of abbreviated dialling to call auser connected to a physical node, possibly international, from anotherphysical node in the network. This possibility can be set in action byusing a proprietary protocol on the international section of the IPnetwork reserved for the company. In this way there is no use of theintelligent network mechanism based on the protocols that are alreadystandardised or in the process of standardisation, such as the protocolcalled CAMEL PHASE 1, PHASE 2, PHASE 3, PHASE 4.

[0097] Obviously the details of how this is done can be altered withrespect to what has been described and illustrated, without however,leaving the context of this invention.

1. Physical private mobile telecommunications network, characterised bythe fact that it includes at least one first (1) and at least one second(2) physical node, which can co-operate with respective different publicmobile networks (PLMN1, PLMN2), said first (1) and second (2) physicalnode having the respective following functionalities: a maskingfunctionality (M1, M2) for managing the interworking with the respectivepublic mobile network (PLMN1, PLMN2) and for managing a virtual usermobility between physical nodes (1, 2) as they are involved, a filteringfunctionality (F1, F2) for analysing the number of the internal customercalled/calling in relation to the caller/called party identity in orderto ensure that the call treatment methods, registered in thecorresponding profiles, and the Incoming Call Screening functionalityare carried out, an intelligent services and coordination managementfunctionality (INC1, INC2), which can set up the call between physicalnode of origin and visited physical node, and permits the invocation ofintelligent services inside the different physical nodes and/or madeavailable by the public networks (PLMN1, PLMN2), and an interworkingfunctionality (ITW1 ITW2) configured to allow interworking between thecircuit-switched signalling, preferably on the GSM A interface, and thesignalling on the Internet Protocol network (IP).
 2. Telecommunicationsnetwork as per claim 1, characterised by the fact that the first (1) andthe second (2) physical nodes cooperate with the said respectivedifferent public networks (PLMN1, PLMN2) via interfaces to therespective MSC/VLR nodes of said respective public networks (PLMN1,PLMN2).
 3. Telecommunications network as per claim 2, characterised bythe fact that said interface is an A interface.
 4. Telecommunicationsnetwork as per any of the claims 1 to 3, characterised by the fact thatsaid first (1) and second (2) physical nodes include a functionalitythat can be used to perform switching activities (FC1, FC2) connected toa respective local PABX (PBX1, PBX2), and can be used to exchangesignalling information with a respective public fixed network (PSTN1,PSTN2).
 5. Telecommunications network as per claim 1 or 4, characterisedby the fact that said respective public networks (PLMN1, PLMN2, PSTN1,PSTN2) are located in different countries.
 6. Telecommunications networkas per any of the claims 1 to 5, characterised by the fact that thesignalling information, the voice and data services on this networktravel on the Internet Protocol network (IP), preferably in VoIP mode.7. Telecommunications network as per claim 2 or 3, characterised by thefact that said masking functionality (M1, M2) is configured to simulatethe GSM standard protocol, in particular interface A to the MSC/VLR nodeof the respective public mobile network (PLMN1, PLMN2) to which therespective physical node (1, 2) is connected, and is configured tomanage the virtual user mobility between the physical nodes as they areinvolved.
 8. Telecommunications network as per claim 2 or 7,characterised by the fact that said masking functionality (M1, M2) isconfigured to generate the messages needed for user mobility management,call management and radio resources management both when activationcomes directly from a mobile terminal, and when it is induced by thefiltering functionality (F1, F2).
 9. Telecommunications network as perany of the previous claims, characterised by the fact that said first(1) and second (2) physical nodes include a respective database (Visit1,Visit2) containing visitor user profiles, and by the fact that saidfiltering functionality (F1, F2) responds to said masking functionality(M1, M2) to examine the incoming/outgoing calls, and consequently saidmasking functionality (M1, M2) sees to the activating of saidcoordination functionality (INC1, INC2) after consulting the profile inthe respective visitor user database (Visit1, Visit2), and therefore thevisitor users belong to public networks of other operators being managedas per these methods.
 10. Telecommunications network as per any of theprevious claims, characterised by the fact that said first (1) andsecond (2) physical nodes include a respective database (Visit1, Visit2)containing visitor user profiles, and by the fact that saidfunctionality for the management of the intelligent services (INC1,INC2) Is configured to allow the use of services managed by therespective physical node (1, 2) as if each visitor user were on therespective physical node of origin (1, 2).
 11. Telecommunicationsnetwork as per any of the previous claims, characterised by the factthat said first (1) and second (2) physical nodes include a respectiveresident user database (Home1, Home2) containing the profiles of theusers defined on the respective physical node.
 12. Telecommunicationsnetwork as per claim 11, characterised by the fact that said residentusers database (Home1, Home2) includes a user profile for each residentuser containing the following information: access rights to thetelecommunications services for the respective resident user,instructions required for the management of intelligent services, theusers associated to said database (Home1, Home2) are users connected tothe different public networks (PLMN1 and PLMN2).
 13. Telecommunicationsnetwork as per claim 11 or 12, characterised by the fact that saidresident user database (Home1, Home2) includes the capability toretrieve information from corporate databases (BDS1, BDS2) containingsensitive company data that is necessary to provide a total reachabilityservice.
 14. Telecommunications network as per claim 1 or 13,characterised by the fact that said first (1) and second (2) physicalnodes also include a network user reachability service, which means thatany other calling user connected to a network physical node (1, 2) i.e.on the respective public mobile network (PLMN1, PLMN2), can be directlyconnected to the user called over the same telecommunications network.15. Telecommunications network as per any of the previous claims,characterised by the fact that it can be configured as desired by theuser in order to search for the real position of the user in the networkby signalling, with the consequent possibility of retrieving informationon the real whereabouts of said user, preferably together with theattributes associated to him in the network environment. 16.Telecommunications network as per any of the previous claims,characterised by the fact that the communication between at least afirst (1) and at least a second (2) physical node takes place on asection of the Internet Protocol network (IP) reserved to the network.17. Telecommunications network as per claim 1 or claim 16, characterisedby the fact that it can be configured to use the abbreviated diallingfor the call between at least a first (1) and at least a second (2)physical node.
 18. Telecommunications network as per any of the previousclaims, characterised by the fact that said masking functionality (M1,M2), said filtering functionality (F1, F2) and said coordinationfunctionality (INC1, INC2) are configured to simultaneously manage areal user mobility between cells relating to said first (1) and second(2) physical nodes and a virtual mobility with respect to saidrespective different public mobile networks (PLMN1, PLMN2). 19.Telecommunications network as per claim 1, characterised by the factthat said first (1) and second (2) physical nodes possess a group ofsaid respective functionalities (M1, M2; F1, F2; INC1, INC2; FC1, FC2;ITW1, ITW2) in combination with each other.